6.11 Gas ballast oper
aon
Gas ballast is operated by a black plasc knob that may be posioned to either posion
0 (which means the gas ballast is closed), posion 1, or any other elevated rim result
that feeds air to the pumping mechanism with a ow of approximately 25 slm.
If water vapor is present within the system, or will be pumped by the product the gas
ballast must be used to prevent damage to the product. The gas ballast should connue
to be applied with the pump running, for at least 1 hour aer the water vapor source
has been removed to enable the pump to dry.
Figure 16 Gas ballast open-close
1. Posion 0 (gas ballas
t is closed) 2. Posion 1 (gas ballast is open)1. Posion 0 (gas ballast is closed) 2. Posion 1 (gas ballast is open)
6.12 Gas ballast adaptor t
The manually operated gas ballast knob can be replaced by a gas ballast adaptor which
enables e
xternal electrically actuated valves or a controlled gas supply to be used
through a 1/4 inch push t connector. To install the gas ballast adaptor:
05/2021 - ©Edwards Limited
Page 36A90301880_C
A90301880_C - Oper
aon
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